1.这是一个同步的返回简单字符串的ajax 案例
function add(){verification();var s = $('#numfin').val();if(s>0){alert("有正在处理的单子,不能继续新增!");return false;}form1.action = "url1" form1.submit();}function verification(){$.ajax({url:'url2',type:'POST',async: false, //同步,因为上面要用到此方法的返回值，所以这里执行完后再执行下面的data:{id:5,name:'mengzi'},dataType:'text', //指定返回一个简单字符串就可以success:function(data){ alert(data);$('#numfin').val(data); }}); }--------------------------------------------------@RequestMapping(value = "ur2", method = RequestMethod.POST)public void verification(HttpServletRequest arg0, HttpServletResponse arg1, Model model, Writer writer) {logger.info("进入验证方法"); try {String id = arg0.getParameter("id");String name = arg0.getParameter("na